Hey everyone. I’m pretty new to the hobby, tank is cycled and I just found a formula for the measurements for my tank (it’s a corner tank and I haven’t looked to far into it. I just took the word of the guy I bought it from) it’s about 37 gallons. I do have it slightly over stocked but my readings don’t seem right. I have 0 ammonia and nitrates but my nitrites are between 0 and 5. Is this going to cause a problem? Could I possibly add another fish?